19970100 has 54 divisors (see below), whose sum is σ = 62597990. Its totient is φ = 5325120.

The previous prime is 19970081. The next prime is 19970117. The reversal of 19970100 is 107991.

It can be written as a sum of positive squares in 3 ways, for example, as 2178576 + 17791524 = 1476^2 + 4218^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10195 + ... + 11994.

Almost surely, 2^19970100 is an apocalyptic number.

19970100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19970100 is an abundant number, since it is smaller than the sum of its proper divisors (42627890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19970100 is a wasteful number, since it uses less digits than its factorization.

19970100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22209 (or 22199 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 19970100 is about 4468.7917830214. The cubic root of 19970100 is about 271.3064257168.

The spelling of 19970100 in words is "nineteen million, nine hundred seventy thousand, one hundred".